Change project name to Thun.

I waited too long to upload to PyPI and some other bastard snagged the name.  I originally wanted to call it "Thun" as a tribute to Manfred von Thun, but I was concerned that this might seem to violate the thrid clause in the license of the original Joy code, to wit:

3. The name of the author may not be used to endorse or promote products  derived from this software without specific prior written permission.

Since the author is deceased I don't know of whom to ask permission to call this project Thun, but since I am not trying to "endorse or promote" this project with his name it should be alright.  In any event if anyone complains I can rename the project again.

setup.py

@@ -3,27 +3,27 @@
 #
 #    Copyright © 2014, 2015, 2017 Simon Forman
 #
-#    This file is part of joy.py
+#    This file is part of Thun
 #
-#    joy.py is free software: you can redistribute it and/or modify
+#    Thun is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
 #    the Free Software Foundation, either version 3 of the License, or
 #    (at your option) any later version.
 #
-#    joy.py is distributed in the hope that it will be useful,
+#    Thun is distributed in the hope that it will be useful,
 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #    GNU General Public License for more details.
 #
 #    You should have received a copy of the GNU General Public License
-#    along with joy.py.  If not see <http://www.gnu.org/licenses/>.
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
 #
 from distutils.core import setup
 from textwrap import dedent
 
 
 setup(
-  name='Joypy',
+  name='Thun',
   version='0.1.0',
   description='Python Implementation of Joy',
   long_description=dedent('''\
@@ -35,10 +35,13 @@ setup(
   author='Simon Forman',
   author_email='[email protected]',
   url='https://osdn.net/projects/joypy',
+  license='GPLv3+',
   packages=['joy', 'joy.utils'],
   classifiers=[
     'Development Status :: 4 - Beta',
     'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
     'Programming Language :: Python :: 2.7',
+    'Programming Language :: Other',
+    'Topic :: Software Development :: Interpreters',
     ],
   )